Contenidos
Imágenes
Subir su imagen
DSS Images Other Images
Artículos relacionados
UBVRI photometry of the Durham-AAT redshift survey
Using the PDS microdensitometer at the Royal Greenwich Observatory, wehave acquired U, B, V, R and I surface photometry from UK Schmidtphotographic plates for all the galaxies with measured redshifts in theDurham-AAT redshift survey. By comparison with CCD photometry we showthat such precision photographic photometry of galaxies off IIIaemulsions is capable of an accuracy as good as a few hundredths of amagnitude. We discuss the color-related properties of these galaxies,and derive luminosity functions in each waveband. We show that, whendivided by color, the faint-end slope of the luminosity function of thebluer galaxies is significantly steeper than that for the redder ones.
| The Montreal Blue Galaxy Survey.III.Third List of UV-Bright Candidates
We present and discuss the latest addition of the Montreal Blue Galaxy(MBG) survey. Inspection of 59 Curtis Schmidt plates resulted in theidentification of 135 new UV-bright galaxies with B < 15.5. Thisbrings the total number of MBGs to 469. New results of the V/V_m testshow that our survey is complete to B = 14.7. From our most recentspectroscopic follow-up, we confirm the discovery of one new Seyfert 1galaxy and possibly one new Seyfert 2 galaxy. We confirm also the biasof the MBG survey towards the low-excitation and metal rich StarburstNucleus Galaxies (SBNGs). The spectral characteristics of the MBGs aresimilar to those of the infrared luminous IRAS galaxies. As a commoncharacteristic, they show a mean ratio Log([NII]/Hα ) in excess of0.2 dex as compared to normal disk HII regions. In general, the MBGshave lower far-infrared luminosities (LIR < 10(11)Lsun) and are nearer (z < 0.05) than the luminous IRASgalaxies. The distribution of the morphologies of the MBGs indicates ahigh number of early-type spirals (Sb and earlier). Nearly half of thesegalaxies also possess a bar. In our sample, the fraction of galaxieswith bars depends on the morphology and increases towards the late-typespirals. However, if we consider only isolated galaxies, the late-typespirals show a clear tendency to be barred. Signs of a recentinteraction with neighbor galaxies are obvious only in 24% of ourcandidates. Although this number is only a lower limit, it isnevertheless sufficiently low to suggest that in a majority of massivegalaxies the burst of star formation do not depends solely on dynamicalprocesses.
| A complete galaxy redshift sample. III - Methods and catalogue
Redshifts and photometry are presented for 329 field galaxies selectedin five high-latitude fields to limiting isophotal B1 magnitudes ofabout 17. The essential spectroscopy was obtained at theAnglo-Australian Telescope. It is demonstrated that the photometricprecision is better than 0.10 mag and that the radial velocity errorsare mostly below 45 km/s. Some aspects of the galaxy distribution andspectral-line statistics are briefly discussed.
| Southern Galaxy Catalogue.
Not Available
|
Enviar un nuevo artículo
Enlaces relacionados
- - No se han encontrado enlaces -
En viar un nuevo enlace
Miembro de los siguientes grupos:
|
Datos observacionales y astrométricos
Catálogos y designaciones:
|
